CN212450827U - External circulation denitrification bioreactor - Google Patents
External circulation denitrification bioreactor Download PDFInfo
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- CN212450827U CN212450827U CN202021789531.0U CN202021789531U CN212450827U CN 212450827 U CN212450827 U CN 212450827U CN 202021789531 U CN202021789531 U CN 202021789531U CN 212450827 U CN212450827 U CN 212450827U
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Abstract
The utility model relates to an external circulation denitrification bioreactor, which comprises a PLC control system and a bioreactor tank body, wherein the inside of the tank body is divided into a water distribution area, a filling area, a separation area and a water outlet area from bottom to top in sequence; the utility model discloses simple to operate does not influence sewage treatment plant normal production, and running cost is cheap.
Description
Technical Field
The utility model relates to sewage treatment, in particular to a device for strengthening biological denitrification efficiency, which is an external circulation denitrification bioreactor.
Background
According to incomplete statistics, the number of sewage treatment plants which are built to operate in the national range is about 4500. Due to the influences of factors such as unbalanced carbon/nitrogen/phosphorus ratio of inlet water, weakened denitrification effect of low-temperature environment in winter and the like, most sewage treatment plants have the problem that the total nitrogen of outlet water exceeds the standard to different degrees. The traditional solution is as follows: (1) adding nutritive salt and regulating the carbon-nitrogen ratio. The current commonly used carbon sources comprise sodium acetate, glucose and the like, and due to the influences of factors such as large tank capacity of a biochemical tank of a sewage treatment plant, insufficient stirring and the like, the effective utilization rate of the carbon source is low, the biological denitrification effect is not high, and the operation cost is greatly increased; (2) adding biological agents to strengthen denitrification. The biological agent needs longer activation time to play a role, and because of the continuous change of the environment, the denitrification effect of the biological agent is gradually reduced after the biological agent is added into a biochemical pool, the biological agent needs to be added periodically, however, the adding cost of the biological agent is very high; (3) the original process is modified, such as adding biological filler, building a deep bed denitrification filter and the like. As the sewage treatment plant is an important civil engineering and also an important facility for protecting the water environment, once a large amount of engineering reconstruction is carried out, the normal operation of the sewage treatment plant is inevitably influenced, and even the water quality condition of the cross section of a basin is deteriorated to destroy the water ecology.
SUMMERY OF THE UTILITY MODEL
The total nitrogen of water outlet that faces to sewage treatment plant is not up to standard, and takes the traditional mode and wastes time and energy and the objective reality of spending money again, the utility model discloses research and developed a simple to operate, do not influence sewage treatment plant normal production, operation low cost's denitrification bioreactor.
An external circulation denitrification bioreactor,
the device comprises a PLC control system and a bioreactor tank body, wherein the interior of the tank body is sequentially divided into a water distribution area, a filling area, a separation area and a water outlet area from bottom to top;
a water distributor is arranged in the water distribution area; the sewage to be treated is connected with a first water inlet of a three-way pipeline mixer through a water inlet lift pump and a water inlet flow meter, a water outlet of the pipeline mixer is connected with a water inlet of a water distributor through a pipeline, and liquid medicine in a nutrient salt dissolving medicine box is connected with a second water inlet of the pipeline mixer through a nutrient salt feeding metering pump and a nutrient salt feeding flow meter;
the filling area is provided with rope type filling;
honeycomb inclined tube filler is arranged in the separation area; a three-phase separator is arranged above the honeycomb inclined tube filler; a water outlet pipe is arranged on the side wall surface of the water outlet area;
a water inlet WTW TresCon total nitrogen analyzer is arranged on a pipeline between the water inlet lift pump and the water inlet flowmeter and is in signal connection with the PLC control system through a lead;
the water outlet pipe is provided with a water outlet WTW TresCon total nitrogen analyzer which is in signal connection with the PLC control system through a lead;
a motor of the water inlet lift pump is connected with a PLC control system through a frequency converter, and the start, the stop and the flow of the water inlet lift pump are controlled through the PLC control system;
the water inlet flowmeter is in signal connection with the PLC control system through a lead;
a motor of the nutrient salt feeding metering pump is connected with the PLC control system through a frequency converter, and the start, the stop and the flow of the nutrient salt feeding metering pump are controlled through the PLC control system;
the nutrient salt feeding flowmeter is in signal connection with the PLC control system through a lead.
The separation area is provided with a dissolved oxygen detection instrument which is connected with the PLC control system through a lead.
A sludge discharge port with a sludge discharge/emptying valve is arranged at the bottom of the water distribution area tank body;
and a gas delivery pipe of the three-phase separator is arranged on the top or the side wall surface of the water outlet area.
The application of the external circulation denitrification bioreactor in sewage treatment is characterized in that:
taking the effluent of a domestic sewage biochemical treatment system or a biochemical pool of a domestic sewage treatment plant as sewage to be treated, and feeding the effluent into a water distributor at the bottom of a reactor for water distribution through a water inlet lifting pump, a water inlet flow meter and a pipeline mixer;
glucose with the mass concentration of 20-30% is filled in the nutrient salt dissolving medicine box, and enters a pipeline mixer through a nutrient salt feeding metering pump and a nutrient salt feeding flowmeter to be mixed with the sewage to be treated; the upward flow mode passes through a filler area, and a rope type filler is arranged in the filler area; then the ascending flow passes through a honeycomb-shaped inclined tube filler, a three-phase separator is arranged at the upper part of the honeycomb-shaped inclined tube filler, and the gas is led out through the three-phase separator;
data information such as a water inlet flow meter, a water inlet WTW TresCon total nitrogen analyzer, a nutrient salt adding flow meter, a dissolved oxygen detecting instrument and a water outlet WTW TresCon total nitrogen analyzer is collected and fed back to a nutrient salt adding metering pump through comprehensive analysis of a PLC control system, and the adding amount of the drug can be controlled.
The control basis of the dosage of the nutritive salt is as follows,
M＝8(TNinto-TNGo out)Q-(CODInto-CODGo out)Q
M-amount of added carbon source (t/h, ton/h)
TNIntoReactor feed Total Nitrogen (mg/L)
TNGo outReactor effluent total nitrogen (mg/L)
CODIntoReactor feed water COD (mg/L)
CODGo outReactor effluent COD (mg/L)
Q-daily amount of treated Water (m)3/h)。
The temperature of the sewage in the reactor is 12-15 ℃, and the hydraulic retention time of the sewage is 2-2.5 h. The utility model discloses product advantage:
1. the installation and the use are convenient. And the container type integrated standardized equipment is adopted, so that the transportation, the installation and the batch production are facilitated. The original pavement and open space of the sewage treatment plant can be fully utilized, and the sewage treatment plant can be used only by carrying out simple equipment foundation and pipeline electrical construction.
2. The automation degree is high. The carbon source adding of the biochemical system of the traditional sewage treatment plant usually refers to experimental data, the adding is carried out by depending on operation experience, and the problems of poor biological denitrification effect, high operation cost and the like are caused by the lack of a linkage mechanism of the quality of inlet water, denitrification efficiency and nutrient salt adding amount. The device feeds back data such as chemical oxygen demand, dissolved oxygen, nitrate, nitrite and a flowmeter to the nutritive salt adding device through acquisition and analysis of the data, realizes a linkage control system of water quality index, denitrification effect and medicament adding, and is integrated in a PLC control system of the device. The operation of excessive personnel is not needed, and the requirement on the professional technology of field operation personnel is low.
3. Small occupied area and high treatment efficiency. The device leads to the setting of filler, swash plate and three-phase separator, furthest has held back the activated sludge of enrichment denitrification flora, and activated sludge concentration reaches 6000 ~ 9000mg/L, is 2 ~ 3 times of traditional biochemical treatment technology activated sludge concentration, therefore area is less relatively, is convenient for utilize sewage treatment plant's road, empty ground to install. Meanwhile, due to the integration of a nutrient salt adding system and an automatic control system, the effect of removing total nitrogen by nutrient salt and denitrifying bacteria is exerted to the maximum extent under the condition of high activated sludge amount. The denitrification efficiency of the unit space is 3-4 times of that of the traditional biochemical pool.
4. The operation cost is low. The device has rich denitrifying flora and high unit volume treatment efficiency, integrates an automatic denitrification control system, and ensures that the nutrient salt addition is timely changed along with the water quality and the biological denitrification effect of inlet water, thereby greatly improving the effective utilization rate of the nutrient salt and reducing the medicament cost of biological denitrification.
Drawings
FIG. 1 is a schematic view of the structure of the device of the present invention;
in the figure:
1. a water intake lift pump; 2. a water inlet flow meter; 3. a pipeline mixer; 4. a perforated water distributor; 5. a mud/air release valve; 6. a water inlet WTW TresCon total nitrogen analyzer; 7. a nutrient salt feeding flowmeter; 8. adding a nutrient salt into a metering pump; 9. a nutrient salt dissolving medicine box; 10. a dissolved oxygen detection instrument; 11. an effluent WTW TresCon total nitrogen analyzer; 12. PLC control system
Detailed Description
Comprises a bioreactor tank body, wherein the interior of the tank body is sequentially divided into a water distribution area, a filling area, a separation area and a water outlet area from bottom to top;
a perforated water distributor 4 is arranged in the water distribution area (the perforated water distributor is composed of a conduit with water outlet through holes on the outer wall surface, one end of the conduit is closed, and the other end of the conduit is used as a water inlet); the sewage to be treated is connected with a first water inlet of a pipeline mixer (a three-way mixer) through a water inlet lift pump 1 and a water inlet flow meter 2, a water outlet of the pipeline mixer is connected with a water inlet of a perforated water distributor through a pipeline, and liquid medicine in a nutrient salt dissolving medicine box is connected with a second water inlet of the pipeline mixer through a nutrient salt feeding metering pump and a nutrient salt feeding flow meter;
the filler area is provided with rope type fillers (C2 type soft fillers in green environment-friendly filler factories in Yixing city); the separation area is provided with honeycomb type inclined tube filler (Henan Hua constant environmental protection PVC phi 50)
1000 × 1000 × δ); a three-phase separator (environmental protection science and technology limited of Henan Yi, model YK-WS3.0) is arranged above the honeycomb type inclined tube filler; a water outlet pipe is arranged on the side wall surface of the water outlet area;
a sludge discharge port with a sludge discharge/emptying valve 5 is arranged at the bottom of the water distribution area tank body;
the motor of the water inlet lift pump is connected with a frequency converter in the PLC control cabinet through a wire, and the start-stop and the flow (water outlet amount in unit time) of the pump are controlled through a PLC control system, so that the water inlet flow is controlled;
a water inlet WTW TresCon total nitrogen analyzer is arranged on a pipeline between the water inlet lift pump and the water inlet flowmeter and is in signal connection with the PLC control system through a lead;
the water inlet flowmeter is in signal connection with the PLC control system through a lead;
the nutrient salt feeding flowmeter is in signal connection with the PLC control system through a lead;
a motor of the nutrient salt feeding metering pump is connected with a frequency converter in a PLC control cabinet through a wire, and the PLC control system controls the starting and stopping of the pump and the flow (water yield in unit time) so as to control the feeding amount of the nutrient salt.
An outlet water WTW TresCon total nitrogen analyzer (TresCon A111+ ON210+ ON510) is arranged ON the outlet pipe and is in signal connection with the PLC control system through a lead;
a dissolved oxygen detection instrument is arranged in the separation area and is in signal connection with the PLC control system through a lead;
the effluent (to-be-treated sewage) from a biochemical sewage treatment system or a biochemical pool of a sewage treatment plant enters a perforated water distributor 4 at the bottom of a reactor for uniform water distribution through a water inlet lifting pump 1 (water pump), a water inlet flow meter 2 and a pipeline mixer 3. Glucose with the mass concentration of 30% is prepared in the nutrient salt dissolving medicine box 9, and enters the pipeline mixer 10 through the nutrient salt feeding metering pump 8 and the nutrient salt feeding flow meter 7 to be effectively mixed with source water (sewage to be treated). The upflow mode passes through the filler area, and the filler area is provided with the rope type filler, so that the microbial biomass is increased, and the denitrification treatment effect is improved. Then the ascending flow is filled by a honeycomb-type inclined tube to realize solid-liquid separation, the length of the inclined tube is 1m, the inclined angle between the inclined tube and the horizontal plane is 60 degrees, and a three-phase separator is arranged at the upper part of the inclined tube sediment to further effectively separate the denitrification sludge and the effluent, ensure the anoxic environment required by denitrification, improve the denitrification effect, and lead out the gas through the three-phase separator. Data information such as an inlet water flow meter 2, an inlet water WTW TresCon total nitrogen analyzer 6, a nutrient salt adding electromagnetic flow meter 7, a dissolved oxygen meter 10, an outlet water WTW TresCon total nitrogen analyzer 11 is collected, and is fed back to a nutrient salt adding metering pump 8 through comprehensive analysis of a PLC system (Siemens SMART200, Siemens S7-200 SMART) to control the adding amount.
The operation parameters are as follows:
(1) designing a treatment scale: 100m3/d
(2) The reactor size: phi 2m x 2.86m
(3) Hydraulic retention time: 2h
(4) Water temperature: 12-15 deg.C
(5) The treated raw water is discharged from a secondary sedimentation tank of a domestic sewage treatment plant in Kangping county. Adding according to the following formula, wherein the effluent reaches the first-grade A total nitrogen discharge standard.
| Monitoring index | Inflow water | Discharging water | Removal rate |
| COD(mg/L) | 56-65 | 24-40 | 38-57％ |
| TN(mg/L) | 28-49 | 7-14 | 71-75％ |
M＝8(TNInto-TNGo out)Q-(CODInto-CODGo out)Q
M-amount of added carbon source (t/h, ton/h)
TNIntoReactor feed Total Nitrogen (mg/L)
TNGo outReactor effluent total nitrogen (mg/L)
CODIntoReactor feed water COD (mg/L)
CODGo outReactor effluent COD (mg/L)
Q-daily amount of treated Water (m)3/h)
The amount of the nutrient salt added every day is 13-25 Kg.
Claims (3)
1. An external circulation denitrification bioreactor, which is characterized in that:
the device comprises a PLC control system and a bioreactor tank body, wherein the interior of the tank body is sequentially divided into a water distribution area, a filling area, a separation area and a water outlet area from bottom to top;
a water distributor (4) is arranged in the water distribution area; sewage to be treated is connected with a first water inlet of a three-way pipeline mixer (3) through a water inlet lift pump (1) and a water inlet flow meter (2), a water outlet of the pipeline mixer is connected with a water inlet of a water distributor through a pipeline, and liquid medicine in a nutrient salt dissolving medicine box (9) is connected with a second water inlet of the pipeline mixer through a nutrient salt feeding metering pump (8) and a nutrient salt feeding flow meter (7);
the filling area is provided with rope type filling;
honeycomb inclined tube filler is arranged in the separation area; a three-phase separator is arranged above the honeycomb inclined tube filler; a water outlet pipe is arranged on the side wall surface of the water outlet area;
a water inlet WTW TresCon total nitrogen analyzer (6) is arranged on a pipeline between the water inlet lift pump (1) and the water inlet flowmeter (2) and is in signal connection with the PLC control system (12) through a lead;
the water outlet pipe is provided with a water outlet WTW TresCon total nitrogen analyzer (11) which is in signal connection with the PLC control system through a lead;
a motor of the water inlet lift pump is connected with a PLC control system through a frequency converter, and the start, the stop and the flow of the water inlet lift pump are controlled through the PLC control system;
the water inlet flowmeter is in signal connection with the PLC control system through a lead;
a motor of the nutrient salt feeding metering pump is connected with the PLC control system through a frequency converter, and the start, the stop and the flow of the nutrient salt feeding metering pump are controlled through the PLC control system;
the nutrient salt feeding flowmeter is in signal connection with the PLC control system through a lead.
2. The external circulation denitrification bioreactor as set forth in claim 1, wherein:
a dissolved oxygen detecting instrument (10) is arranged in the separation area and is in signal connection with the PLC control system through a lead.
3. The external circulation denitrification bioreactor as set forth in claim 1, wherein:
a sludge discharge port with a sludge discharge/emptying valve (5) is arranged at the bottom of the water distribution area tank body;
and a gas delivery pipe of the three-phase separator is arranged on the top or the side wall surface of the water outlet area.
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| CN202021789531.0U CN212450827U (en) | 2020-08-24 | 2020-08-24 | External circulation denitrification bioreactor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114044570A (en) * | 2021-10-28 | 2022-02-15 | 中信环境技术（广州）有限公司 | Denitrification device and method for denitrifying wastewater with low carbon-nitrogen ratio |
| CN114084954A (en) * | 2020-08-24 | 2022-02-25 | 辽宁省环保集团有限责任公司 | External circulation denitrification bioreactor and application thereof |
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2020
- 2020-08-24 CN CN202021789531.0U patent/CN212450827U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114084954A (en) * | 2020-08-24 | 2022-02-25 | 辽宁省环保集团有限责任公司 | External circulation denitrification bioreactor and application thereof |
| CN114044570A (en) * | 2021-10-28 | 2022-02-15 | 中信环境技术（广州）有限公司 | Denitrification device and method for denitrifying wastewater with low carbon-nitrogen ratio |
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